Update OTA Keybox tests

The rest of http://go/wvgerrit/135982

bug: 187646550
Change-Id: I120b817c1242a22c416625af67c6347b9efec10b

libwvdrmengine/cdm/core/test/keybox_ota_test.cpp

@@ -82,12 +82,6 @@ TEST_F(CdmOtaKeyboxTest, BasicTest) {
   FileSystem file_system;
   TestCdmEngine cdm_engine(&file_system,
                            std::shared_ptr<EngineMetrics>(new EngineMetrics));
-  // Create a singleton crypto session to prevent OEMCrypto from being
-  // terminated. This is really only needed when running the test against the
-  // testbed OEMCrypto which does not save its keybox across init/terminate.
-  metrics::CryptoMetrics crypto_metrics;
-  std::unique_ptr<CryptoSession> crypto_session(
-      CryptoSession::MakeCryptoSession(&crypto_metrics));
   // Remove any existing certificate.
   cdm_engine.Unprovision(kSecurityLevelL1);
   std::string system_id;